Hayday is an English surname that originated in Brittany. Notable people with the surname include:
Adrian Hayday, English professor Andria Hayday, American game designer Arthur Hayday, English unionist and politician Frederick Hayday, British unionist James Hayday, London bookbinder
Other uses include: Hayday (album), from American indie rock band Feeble Little Horse
See also
Haidai (surname) Hay Day, a freemium mobile farming game by Supercell Heyday (disambiguation)